Office 365 not connecting with SBS 2011 server on network

We recently moved our email (6 users) from Exchange on SBS 2011 to Office 365 but we are still using the server as a file server. We changed the dns of each computer to point to the gateway but intermittently Outlook 2013 is trying to resolve to the SBS server, not Office 365 (outlook.office365.com) and email will not connect. Any suggestions?
DavidAsked:
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Andrew CeohanSys & Net AdminCommented:
When you setup O365, did you also change the internal/external DNS records to point to O365 and not your old Exchange server?
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Cliff GaliherCommented:
Outlook uses autodiscovery to find the exchange server it should connect to. DNS is only tried if an AD object is not found. And in SBS, that AD object exists and will try to reclaim connections.

In other words, SBS is messing with you. Retire it; it is near EOL anyways. Go all cloud or migrate domain and file services to a non-SBS server with a newer OS. That will solve your issue if SBS is decommissioned properly.
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DavidAuthor Commented:
Thanks. External DNS has been changed as email works intermittently (for a day or so). We are planning to move to the Cloud but it will take us another month to get through that process.
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